<template>
	<view class="container">
		<!-- 空白页 -->
		<view v-if="!hasLogin || empty===true" class="empty">
			<image src="/static/emptyCart.jpg" mode="aspectFit"></image>
			<view v-if="hasLogin" class="empty-tips">
				空空如也
				<navigator class="navigator" v-if="hasLogin" url="/pages/home/home" open-type="switchTab">随便逛逛></navigator>
			</view>
			<view v-else class="empty-tips">
				空空如也
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else>
			<!-- 列表 -->
			<view class="cart-list">
				<block v-for="(item, index) in cartList" :key="item.id">
					<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">
						<view class="image-wrapper">
							<image :src="item.listPicUrl" :class="[item.loaded]" class="loaded" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)"
							 @error="onImageError('cartList', index)"></image>
							<view class="zzhicon icon-check1 checkbox" :class="{checked: item.checked}" @click="check('item', index)"></view>
						</view>
						<view class="item-right">
							<text class="clamp title">{{item.goodsName}}</text>
							<text class="attr">{{item.goodsSpecifitionNameValue}}</text>
							<text class="price">¥{{item.retailPrice}}</text>
							<uni-number-box class="step" :min="1" :value="item.number" :isMin="item.number===1" :index="index" :item="item" @eventChange="numberChange"></uni-number-box>
						</view>
						<text class="del-btn zzhicon icon-shanchu" @click="deleteCartItem(item.id)"></text>
					</view>
				</block>
			</view>
			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="checkbox">
					<image :src="allChecked?'/static/selected.png':'/static/select.png'" mode="aspectFit" @click="check('all')"></image>
					<view class="clear-btn" :class="{show: true}" @click="clearCart">
						清空
					</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{checkedGoodsAmount}}</text>
					<text class="coupon" v-if="false">
						已优惠
						<text>74.35</text>
						元
					</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>
		</view>
	</view>
</template>

<script>
	import uniNumberBox from '@/components/uni-number-box.vue'
	export default {
		components: {
			uniNumberBox
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
				hasLogin: false,
				goodsCount: 0,
				goodsAmount: 0.0,
				checkedGoodsCount: 0,
				checkedGoodsAmount: 0.0,
			};
		},
		onShow() {
			this.getCartList();
		},
		onHide() {
			this.hasLogin = false
			this.goodsCount = 0
			this.goodsAmount = 0.0
			this.checkedGoodsCount = 0
			this.checkedGoodsAmount = 0.0
		},
		watch: {
			//显示空白页
			cartList(e) {
				let empty = e.length == 0 ? true : false;
				if (this.empty !== empty) {
					this.empty = empty;
				}
			}
		},
		methods: {
			//获取购物车商品列表
			async getCartList() {
				const that = this;
				that.$http.ajax({
					url: that.$http.adornUrl(that.$api.cartList),
					showLoad: true
				}).then(function(res) {
					if (res.code == 0) {
						that.hasLogin = true
						that.cartList = res.cartList
						that.goodsCount = res.goodsCount
						that.goodsAmount = res.goodsAmount
						that.checkedGoodsCount = res.checkedGoodsCount
						that.checkedGoodsAmount = res.checkedGoodsAmount
						that.calcTotal();
					}
				})
			},
			//去登录
			navToLogin() {
				uni.navigateTo({
					url: '/pages/login/login'
				})
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			//删除
			deleteCartItem(id) {
				const that = this;
				var ids = id ? [id] : that.cartList.map(item => {
					return item.id
				})
				that.$http.ajax({
					url: that.$http.adornUrl(that.$api.cartDelete),
					method: "POST",
					data: JSON.stringify(ids),
					showLoad: true
				}).then(function(res) {
					if (res.code == 0) {
						that.getCartList();
					}
				})
			},
			//选中状态处理
			check(type, index) {
				const that = this;
				let ids, isChecked;
				if (type === 'item') {
					ids = that.cartList[index].id;
					isChecked = that.cartList[index].checked ? 0 : 1;
				} else {
					var idList = that.cartList.map(function(v) {
						return v.id;
					});
					ids = idList.join(',');
					isChecked = that.allChecked ? 0 : 1;
				}
				that.$http.ajax({
					url: that.$http.adornUrl(that.$api.cartChecked),
					method: "POST",
					data: {
						ids: ids,
						isChecked: isChecked,
					},
					showLoad: true
				}).then(function(res) {
					if (res.code == 0) {
						that.hasLogin = true
						that.cartList = res.cartList
						that.goodsCount = res.goodsCount
						that.goodsAmount = res.goodsAmount
						that.checkedGoodsCount = res.checkedGoodsCount
						that.checkedGoodsAmount = res.checkedGoodsAmount
						that.calcTotal();
					}
				})
			},
			//清空
			clearCart() {
				uni.showModal({
					content: '清空购物车？',
					success: (e) => {
						if (e.confirm) {
							this.deleteCartItem();
						}
					}
				})
			},
			//计算总价
			calcTotal() {
				let list = this.cartList;
				if (list.length == 0) {
					this.empty = true;
					this.allChecked = false;
					return;
				}
				let checked = true;
				list.forEach(item => {
					if (item.checked == false) {
						checked = false;
					}
				})
				this.allChecked = checked;
				//this.checkedGoodsAmount = Number(total.toFixed(2));
			},
			//数量
			numberChange(param) {
				var that = this;
				that.$http.ajax({
					url: that.$http.adornUrl(that.$api.cartUpdate),
					method: "POST",
					data: {
						goodsId: param.item.goodsId,
						productId: param.item.productId,
						number: param.data.number,
					},
					showLoad: true
				}).then(function(res) {
					if (res.code == 0) {
						that.hasLogin = true
						that.cartList = res.cartList
						that.goodsCount = res.goodsCount
						that.goodsAmount = res.goodsAmount
						that.checkedGoodsCount = res.checkedGoodsCount
						that.checkedGoodsAmount = res.checkedGoodsAmount
						that.calcTotal();
					}
				})
			},
			//创建订单
			createOrder() {
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item => {
					if (item.checked) {
						goodsData.push(item)
					}
				})
				if (goodsData.length === 0) {
					this.$msg("请选择需要下单的商品")
					return false;
				}
				uni.navigateTo({
					url: `/pages/order/createOrder?type=cart`
				})
			}
		}
	}
</script>

<style lang='scss'>
	page {
		background: #fff;
	}

	.container {
		padding-bottom: 134upx;

		/* 空白页 */
		.empty {
			position: fixed;
			left: 0;
			top: 0;
			width: 100%;
			height: 100vh;
			padding-bottom: 100upx;
			display: flex;
			justify-content: center;
			flex-direction: column;
			align-items: center;
			background: #fff;

			image {
				width: 240upx;
				height: 160upx;
				margin-bottom: 30upx;
			}

			.empty-tips {
				display: flex;
				font-size: $font-sm+2upx;
				color: $font-color-disabled;

				.navigator {
					color: $uni-color-primary;
					margin-left: 16upx;
				}
			}
		}
	}

	/* 购物车列表项 */
	.cart-item {
		display: flex;
		position: relative;
		padding: 30upx 40upx;

		.image-wrapper {
			width: 230upx;
			height: 230upx;
			flex-shrink: 0;
			position: relative;

			image {
				border-radius: 8upx;
			}
		}

		.checkbox {
			position: absolute;
			left: -16upx;
			top: -16upx;
			z-index: 8;
			font-size: 44upx;
			line-height: 1;
			padding: 4upx;
			color: $font-color-disabled;
			background: #fff;
			border-radius: 50px;
		}

		.item-right {
			display: flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position: relative;
			padding-left: 30upx;

			.title,
			.price {
				font-size: $font-base + 2upx;
				color: $font-color-dark;
				height: 40upx;
				line-height: 40upx;
			}

			.attr {
				font-size: $font-sm + 2upx;
				color: $font-color-light;
				height: 50upx;
				line-height: 50upx;
			}

			.price {
				height: 50upx;
				line-height: 50upx;
			}
		}

		.del-btn {
			font-size: 32upx;
			height: 50upx;
			color: $font-color-light;
		}
	}

	/* 底部栏 */
	.action-section {
		/* #ifdef H5 */
		margin-bottom: 100upx;
		/* #endif */
		position: fixed;
		left: 30upx;
		bottom: 30upx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690upx;
		height: 100upx;
		padding: 0 30upx;
		background: rgba(255, 255, 255, .9);
		box-shadow: 0 0 20upx 0 rgba(0, 0, 0, .5);
		border-radius: 16upx;

		.checkbox {
			height: 52upx;
			position: relative;

			image {
				width: 52upx;
				height: 100%;
				position: relative;
				z-index: 5;
			}
		}

		.clear-btn {
			position: absolute;
			left: 26upx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52upx;
			line-height: 52upx;
			padding-left: 38upx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius: 0 50px 50px 0;
			opacity: 0;
			transition: .2s;

			&.show {
				opacity: 1;
				width: 120upx;
			}
		}

		.total-box {
			flex: 1;
			display: flex;
			flex-direction: column;
			text-align: right;
			padding-right: 40upx;

			.price {
				font-size: $font-lg;
				color: $font-color-dark;
			}

			.coupon {
				font-size: $font-sm;
				color: $font-color-light;

				text {
					color: $font-color-dark;
				}
			}
		}

		.confirm-btn {
			padding: 0 38upx;
			margin: 0;
			border-radius: 100px;
			height: 76upx;
			line-height: 76upx;
			font-size: $font-base + 2upx;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}

	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked {
		color: $uni-color-primary;
	}
</style>
